The only way I can describe Sekai Saisoku no Level Up is: A knockoff Na Honjaman Level-Up. Just about every aspect of these first two books is done better in that series. The only exceptions being that this has more fanservice and they both have equally ill-defined power levels.
Seriously, just go read (or re-read) that instead.
In other news, the fifth Shikkaku kara Hajimeru Nariagari Madoushidou! novel is something of an intermission. It mostly concerns itself with cleaning up the aftermath of Book 4‘s insurrection and positioning the protagonist to receive far more notoriety than he may be able to handle from various other countries which may or may not get explored in more detail down the line.
So it basically stays the course.